Excavator.



No. 669,992. Patented mar. I9, l90l.

of HETLESAET'EB.

EXCAVATOB.

(Application filed June 11, 1900.)

9 7 Sh99tsSheet I.

(l lo Model.)

#Egg a/ A WM/ 4 @096 ii No. 669,992. Patented Mar. I9, I90l.

' 0. HETLESAETER.

EXCAVATOR.

' at'o led Ju e 1 (Apphc x n Q n 1. 19 0.) (No Model.) 7 Shams-Sheet 3.

No. 669,992. Paten tad Mar. I9, I901.

0.v HETLESAETER.

EXCAVATOR.

\ (Application filed mm 11, 1900.) (No Model.) 7 Sheets-$haet 4.

Patented Mar. I9, l90l.

0. HETLESAETER.

EXGAVATOR. (Applicdtiozx filed June 11, 1900.)

7 Sheets-Shoat 5.

'(NoModeL) 1w: NORRIS PETER; 0o, rm

' No. 669,992. Patented Mar; I9, 190i.

0. HETLESAETER.

EXCAVATOR.

ication filed June 11, 1900.)

(No Model.) 1 7 Sheets-$hget 6.

Patented Mar. l9, l90l.

0. HETLESAETER.

EXGAVATUR.

(Application filedJune 11, 1900.)

7 $heets-8heet 7.

(No Model.)

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city of Chicago, county of Cook, and State FFICE.

ATE-NT OLAF HETLESAETER, OF CHICAGO, ILLINOIS.

ExcAvAi'oR.

SPECIFIOATION forming part of Letters Patent N 0. 669,992, dated March19. 1961.

Application filed June 11, 1900.

To all witont it may concern.-

Be it known that I, OLAF HETLESAETER, a citizen of the United States,residing in the of Illinois, have invented a new and useful Improvementin Excavators, of which the fol lowing is a specification.

My invention relates to excavators such as dredges, steam-shovels, andlike machines, and is of the class havinga compound bucketarm-that is, abucket-arm composed of relatively movable members-the bucket-arm of thepresent machinebeing allied to the bucket-arm shown in Letters Patent ofthe United States No. 649,244, issued to me May 8, 1900.

It is frequently desirable in excavating to discharge the bucket at aconsiderable distance from the car or other supporting structure of themachine. For example, in excavating for canals or deep cuts inrailwaywork it is of great advantage to discharge the bucket at a pointhigh on the side or spoil banks, thus eliminating the use of tram-carsor other conveyers for removing the excavated material from the cut orchannel.

It is the chief object of my present invention to provide means wherebythe bucketarm may be controllably extended so that the bucket may bedischarged at a considerable height above and distance from the mainsupporting structure of the machine. To accomplish this object, I haveprovided various 7 novel devices, more specifically set forth in thedescription and claims herewith. I attain this object by the mechanismillustrated in the accompanying drawings, in which- Figure l isasideview of the machine mount ed upon a railway-car, showing the bucket-.arm in an upright position. The bucket and handle are retracted, and thefolding frame is collapsed or folded. Said frame is discontinuouslyshown in this figure, the apex of said frame being separate to bring thefigure within the limits of the sheet. Fig. 2 is a view of the machinein side elevation, showing the bucket-arm in an approximately horizontalposition. The bucket and handle are partially extended. Fig. '3 is afront view of the yoke of the post of the folding frame and adjunctslooking in the direction of the arrow, Fig. 2. Figs. 4 and 5 jointlyrepresent Serial No. 19,793. \No modeLl the entire machine in sideelevation, Fig. 4 showing the car and parts mounted thereon and Fig. 5showing the forward extremity of the bucket-arm. bucket-arm is rotatedto its extreme position for discharging and the bucket-handle isextended to the limit of its forwardtravel. Fig. 5 clearly illustratesthe manner of supporting the bucket end of the bucket-handle, the bailand the forward rods of the folding frame being under tension and theframe post and yoke being under compression. Fig. 6 is a detail view ofthe trolley, showing the manner in which the extremity of thebuckethandle opposite to the bucket is slidingly supported upon thatmember of the bucketarm which forms the track or guide-beam for saidtrolley. The beam of the buckethandle nearest the observer is removed inorder to show the position of the trolley-rollers upon the guide-beam.Fig. 7 is a sectional view in detail of the bucket-handle, guidebeam,and trolley, taken on the line 7 7, Fig. 6, looking in the direction ofthe arrows. Fig. 5 is a plan view of the crane and of the turret andcircular track whereby said crane is supported. Fig. 9 is a side view indetail of the buckethandle, trolley, and guidebeam. Fig. 10 is a planview of the parts shown in Fig. 9. i Fig. 11 isadetail view from theside, showing the manner of supporting the crane upon the platform ormain body of the excavator. Fig. 12 isa side detail view of the partswhereby the oscillating lever is supported. Fig. I3 is a view of thesaid supporting parts looking in the direction of the arrow, Fig. 12.Fig. 14 is a front view looking in the direction of the arrow, Fig. 11,showing the frame which forms an auxiliary support for the crane.

Similar characters refer to similar parts throughout the several views.

The car a forms the mainsupportingstructure of the machine and has theturret I) mounted at its forward extremity. In order to'raise saidturret above the platform or carbody a, said car is provided with theraised portion of false bottom a Said turret consists of a preferablymetallic frame having a broad base a bolted to said raised portion asaid turret tapering toward its upper extremity and having at said upperextremity a col- In said Figs. 4. and 5 the and suspended from saiduprights 0 0 in such l lar d, which forms a bearing for the cranepivote, as shown in Fig. 11. For convenience said turret is constructed insections, which may be bolted together in the completed machine. A lug0r Webfis formed within said turret to afford an auxiliary lateral braceand bearing for said pivot e. The pivot 'econ'sists of a hollow shaftbearing upon said collar 01 and in said lug or web fand having rigidlysecured at the lower extremity thereofa horizontally-extending plate orturntable g. At the periphery of said turn-table g are carried theguide-sheaves h h, which lie horizontally and guide the thrusting-cablejand controlling-cable 7c in the manner hereinafter described. Thecrane-beams m m are secured to said pivot e at a point thereon above theturret b, said beams being substantially parallel and coextensive andextending in both rearward and forward directions from said turret. Inthe forward direction from said turret the beams m m bend upward inorder to provide an elevated front extremity of the crane, at whichlatter point the bucketarm is supported, as will hereinafter appear. Ata point between the turret b and the said forward extremity of the craneis the framen, which forms an auxiliary support for said crane, as shownin detail in Figs. 11 and 14. Said frame consists of the uprights 0 0,which are recessed at their upper extremities to receive the beams m mand are provided at their lower extremities with the flanged wheels orcasters 19p, adapted to travel upon the circular track q. The uprights 00 are held in their proper relative positions by the distance-piece rand plate 3, the latter being secured to said uprights above the beams mm, thereby holding said beams within the said recessed uprights. Thetrack q is mounted upon the beam 25, secured to the raised portion a ofthe car a, and both said track and beam are concentric with the axis ofthe crane-pivot e. The beams to u are attached to the beams m m in frontof said frame n and are also fastened at their lower extremities to theuprights 0 0 near the lower extremities of the latter, said beams u uthereby acting as braces to strengthen the crane. By this construction alarge proportion of the weight of the crane is carried by the track qand car-body directly, thus relieving the turret b and pivote from greatstrain. In order to prevent the possibility of said castersp beingraised from said track during the operation of the machine, the hooks 'uv are attached to a manner as to engage the lower edge of said beam Ifwhen said uprights are lifted any appreciabledistance. Thisprovisioneliminates the danger of straining the crane-pivot and adjacentparts in case the excavator-bucket meets und ue obstructions. Thecrane-beams mmare also braced by tension-rods w w, extending from thecrane-pivot e to the front and rear extremities of said beams.

Mounted side by side at the rear extremity of the crane are the sheavesso and for guiding the cables j and 10, respectively. The sheavesz and 1are also mounted side by side near the upper extremity of thecrane-pivot e for guiding said cables j and 7c, and the sheaves 2 and 3are similarly mounted for the same purpose near the lower extremity ofthe said pivot, (the sheave 3 not appearing in full lines in thedrawings.) The sheaves z, 1, 2, and 3 are so located that the cables andk may extend through the pivot e and may thence lead fair onto theforward ones of the sheaves h h.

Certain of the features of construction of the crane and turret andtheir adj u ncts herein shown are shown and described in applicationsfor Letters Patent filed by me May 7, 1900, Serial Nos. 15,704 and15,705.

The bucket-arm which I will now describe is similar in certain respectsto the bucketarm for which Letters Patent of the United States weregranted to me May 8, 1900, No. 649,244. In the present machine theblocks 4 4 (shown in detail in Figs. 12 and 13) are pivotally supportedupon the shafts 5 5 at the forward extremity of the crane. Said blocksare recessed at their upper or outer extremities to receive the beams 66 of the oscillating lever in such a manner that said beams may slidelongitudinally in said blocks. Said beams are held in place by thecrossframe 7, which is secured to said blocks above said beams andconstitutes a bridge or distance-piece between said blocks. At the upperor outer extremity of said bridge 7 is formed a series of bosses 8,suitably apertu red to receive the tension-rods 9 9. Said rods extend inboth directions from said bridge to the extremities of said beams, wherethey are secured. By this construction by changing the lengths of saidrods 9 9 upon the respective sides of said bridge 7 and sliding saidbeams in said blocks the oscillating lever may be adjusted lengthwise inits support in the manner pointed out in an application for patent filedby me May 7, 1900, Serial No. 15,703. At the extremity of theoscillating lever, which will be referred to as the upper extremitythereof, is the shaft 10, which pivotally supports the thrust-segmentll. Said segment has a curved and grooved periphery approximatelyconcentric with the said shaft 10. The thrust-cablej is connected tosaid thrust-segment at a point 12 at the forward extremity thereof. Ator near the rear extremity of said thrust-segmentis secured the linksbeing pivoted to said beam 14 by means of the shaft 16 and to saidoscillating lever by means of the shaft 17. Said shaft 17is notsupported directly by the beams 6 6 of said oscillating lever, but is soheld by one of the members of the folding frame as to be immovablerelatively to said beams 6 6, the precise construction being shown inFig. 3 and hereinafter described. Said links 15 constitute the fourthmember of a linkwork, of which the oscillating lever, thrust-segment,and guidebeam constitute the other three members. As the connectionsbetween said members are all articulate, it is obvious that the distanceof the shaft 16 from the arm-supporting shafts 5 depends upon thepositions of the members of the said linkwork relatively to each other.

The position of the said shaft lb in a vertical plane is also dependentupon the position of the bucket-arm with respect to the rotation thereofabout the said shafts 5, while the position of said shaft 16 withrespect to a horizontal plane is dependent upon the position of thecranewith regard to its rotation about the axis of the crane-pivot e. Theposition of said shaft 16 with reference to all three of theselast-described movements is completely controlled by means of thecablesj and It in a manner which will be hereinafter described and whichhas been described in the application, Serial No. 15,705, above referredto.

The thrusting-cablej is connected to the segmentll at the point 12thereon and extends from said point 12 rearwardly along the.

grooved periphery of said segment,'thence around the sheave a; at therear extremity of the crane, thence over the sheave 2, downward throughthe crane-pivot e beneath the sheave 2, and thence in a forwarddirection to one of the sheaves h, around which it extends toward theleft looking toward the front of the machine, as indicated by the arrow,Fig. 8. Said cablej ex tends from said forward sheave h to one or moreof the other sheaves h, located upon the left edge of said turn-table g,and then extends over auxiliary guides to drums or other suitabledriving mechanism. (Not shown.)

The controlling-cable 7c is fastened to the lower extremity of theguide-beam 14 and extends from said guide'beam to and around theguide-sheave 18, which is mounted at the upper extremity of theoscillating lever, preferably upon the shaft 10 thereon. From saidsheave 18 said cable it extends to and around the sheave 'y at thereal-extremity of the crane, thence around the sheave 1, through thepivot e beneath the sheave 3, and thence to the forward one of thesheaves h upon the right of the axis of the crane-pivot c. From saidforward sheave It said cable 7c extends rearwardly along one or more ofthe remaining guide-sheaves it upon the right edge of the turn-table gand thence rearwardly over suitable guides to a drum or other drivingmechanism. (Not shown.)

The excavator-bucket 19, which is of the ordinary pattern, is notsuspended directly from the member 14, as in the machine described inthepatent above referred to, but is attached to a separate bucket-handle20. Said bucket-handle consists, preferably, of two parallel I-beams 2121, which are suitably fastened together and carry at their lowerextremity the said bucket 19. At the upper extremity of said handle isthe trolley 22, whereby said handle has a sliding connection with thesaid beam 14. Said trolley (best shown in Figs. 6, 7, 9, and 10)consists of the parallel triangular plates 23 23, which lie on oppositesides of the guide-beam 14. The roller 24 and rollers 25 25 are mountedbetween said plates in such a manner that said roller 24 bears upon andmay travel along the upper surface of said beam 14, and said rollers 2525 lie a slight distance from and may under certain conditions travelalong the under surface of said beam 14 at two different points thereon.By this construction the said trolley encircles the beam and istherefore prevented from becoming dislodged therefrom. Moreover, thesingle roller 24 will ordinarily guide said trolley;

but in case said trolley is forced upwardagainst said beam both of therollers 25 will come to a bearing thereon. The shaft 26 is secured inand extends between said side plates 23 and forms a pivot, whereby theupper extremity of the bucket-handle 20 is connected to the said trolley22. As clearly shown in Fig. 7, said trolley has attached thereto, nearthe upper portion thereof, the eye 27, to which the extension-cable 28is fastened for drawing said trolley and buckethandle along saidguide-beam 14 toward the lower or forward extremity of the latter. Inorder to limit the travel of the trolley in an upward direction, theguide-beam 14 is provided with a stop 29 near its upper extremity,adjacent to the thrust-segment 11. Preferably near the upper surface ofthe guidebeam 14 is mounted the shaft 30, which forms a pivot, wherebythe latch 31 is attached to said beam. Said latch consists of a barhaving a hook 32 at its forward extremity for engaging the roller 24,and thereby arresting the motion of said trolley downward along saidbeam 14. At its forward extremity also said latch has a projection 38,which is beveled upon its lower edge in such a manner that when thetrolley 22 approaches said latch from toward the lower extremity of thebeam 14 the roller 24 strikes the said lower beveled edge and raisessaid latch, thereby permitting said latch to engage said roller andretain said trolley. The pin 34 is attached to the latch 31 near theforward extremity thereof and projects laterally therefrom in such amanner as to occupy a position in front of and somewhat below theaperture of the eye 27 when said latch is in engagement with the roller24. The cable 28 extends from the eye 27 toward the bucket 19, and saidpin 31 is so placed as to rest upon said cable when the roller 24 is inengagement with the latch 31. As said cable thus passes below said pin,when said cable is drawn taut said cable raises said pin and latch, andthereby effects the release of the trolley 22 from said latch.

Having described the manner in which the upper extremity of thebucket-handle is supported, I will now describe the manner of supportingthe bucket 19 and adjacent extremity of the bucket-handle.

The shafts or pins 35 35 are secured to the lower extremities of thebeams 6 6 of the oscillating lever and also to the outer legs 36 36 ofthe yoke 37, thus forming pivotal connections between the said parts.Said legs 36 are rigidly connected at their upper ext-remities to thecross-frame 38 and are at a distance apart greater than the distancebetween the said beams 6 6, thus permitting said beams 6 6 to passbetween them. The central leg 39 is rigidly secured to the frame 38 insuch a manner as to pass between the beams 6 6, as shown in Fig. 3. Thelower extremity of said central leg carries the shaft 17, abovementioned, said shaft 17 being preferably in line with the shafts 35 35and carrying the links 15 in the manner previously described. Said post40 projects upward from said frame 38 and carries at its upper extremitythe shaft 41, which forms a pivot connection between said post 40 andthe bucket tension-rods 42. The length of said rods 42 is preferably approximately equal to the distance between the shafts 35 and 4lthat is,equal to the total length of the post 40. The shaft 43 is sccured to thelower extremity of the rods 42 and forms a pivotal connection betweensaid rods and the bail 44 of the bucket 19. Said bail is pivotallyattached to the trunnions 45, located upon the sides of said bucket. Iprefer to so proportion the links 15, bail 44, and connected parts thatwhen the trolley is engaged by the latch 31 the bucket 19 will be inapproximately the position it would occupy if attached directly to thelower extremity of the guide-beam, this condition being illustrated inFig. 1 of the drawings. Under this condition the present buckethandleand guide-beam together virtually constitute a single bucket-handleoperated substantially in the same manner as the bucket-handle shown inthe patent above referred to. One of the extremities of theretracting-cable 46 is fastened to the above-mentioned shaft 41 andextends from said shaft toward the pivotblock 4 of the oscillatinglever, as will hereinafter be described.

The rods 42 and post 40, with the yoke 37, constitute a folding framewhereby the forces ordinarily acting upon the bucket 19 while the latteris taking a cut or is in a hoisted position will be transmitted to thelower extremity of the beams 6 6 of the oscillating lever.

It is obvious that under usual conditions when the cable 46 is held fastthe rods 42 will be in tension and the post 40 and yoke 37 will be incompression. In order to make provision for the strains in a simplemanner, I prefer to construct the cross-frame 38 of caststeel andconstruct the legs 36 39 and post 40 of suitable pi ping attached bymeans of screwthreads to said frame.

' The extending-cable 28 and retracting-cable 46 are connected andoperated as follows: The extending-cable 28 is attached to the eye 27 onthe trolley 22 and extends from said eye around the guide-sheave 47.(Shown in Fig. Said sheave 47 is mounted upon one of the shafts 35 insuch a manner as not to interfere with the beams 21 of the bucket-handle20. From said sheave 47 said cable 28 extends to and over the sheave 48,mounted upon one of the shafts 5 at the forward extremity of the crane.(Best shown in Figs. 8 and 13.) Said cable 28 extends from. said sheave48 to the drum 49 and is suitably fastened thereto. The shaft 50, uponwhich said drum is mounted, is provided with bearings upon the beams m mof the crane and forms the support also for the drum 51, whereby thecable 46 is operated, and for the spurgear 52, whereby said drums arerotated. Said gear 52 is preferably located midway between said beamsand is driven by means of the spur-pinion 53, secured to the crank-shaft54. Said crank-shaft is driven by the engines 55 55, located forconvenience upon the plate 8 on the crane-beams m m. Theretracting-cable 46 is fastened to the shaft 41 at the apex of thefolding frame and extends thence over the guide-sheave 56, mounted nearthe upper extremity of the bridge 7 of the pivot-blocks 4. The sheave 57is mounted upon the second one of the shafts 5 not occupied by thesheave 48, above mentioned, and is so located as not to interfere withthe beams 21 of the bucket-handle 20. When the bucket-handle isapproximately horizontal, the cable 46 passes under and is guided bysaid sheave 57; but when the bucket-handle is more nearly in an uprightposition the cable 46 extends directly from the sheave 56 to the drum 51in the manner shown in Fig. 1.

To effect the extension of the bucket-handle 20, the cables 28 and 46must run in opposite directions, and as the drums 49 and 51 rotatetogether said cables are wound in opposite directions upon said drums.According to the relative-proportions of the parts as constructed in thepresent instance the cable 28 has a greater distance to run duringextension and retraction of the bucket-handle than has the cable 46.Therefore the drum 49 is constructed with a diameter larger than thediameter of the drum 51.

Generally speaking, the bucket-arm comprises the parts pivotallysupported upon the shafts 5 5 at the forward extremity of the crane, andthe center of gravity of said arm is so located with respect. to saidshafts that gravity tends to rotate said arm in such a direction thatthe bucket 19 is caused to approach the main supporting structure a.

The operation of the machine is as follows: When a out is to be taken bythe bucket 19, the trolley'22 is engaged bythe latch 31, and is therebyheld fast at the upper extremity of the guide-beam 14. Under these circun1- stances the beam 14 and beams 2121 virtually form a singlebucket-handle, constituting one of the members of a linkwork bucket-arm,as described in the above mentioned patent. Moreover, the bail 4:4: andlinks 15 will operate substantially in the same manner as if the bucket19 were connected by single links directly with the lower extremity ofthe beams 6 6 of the oscillating lever. To place the bucket in positionfor excavating, the cables j and 7c are paid out,and the bucket isthereby lowered and allowed to approach to within any desired distanceof the main supporting structu reas, for example, to a position such asthat shown in Fig. 1. If now it is desired to ihrust or crowd the bucketdownward into the bank, the cable is held fast at its rear extremity onthe main structure of the machine, while tension is exerted in thecablej. The force of the tension in said cablej is re solved at thethrust-segment 11 into two components, one of which tends to rotate thebucket-arm about the shafts 5 5 and the other of which tends to rotatesaid segment about the shaft 10. The said rotation of the bucket armforces the bucket in a forward direction to take a cut and at the sametime decreases the distance between the sheave 18 upon the upperextremity of the bucket-arm and the sheaves m and y at the rearextremity of the crane, thereby having virtually the effect of payingout the cable It in so far as the effect upon the bucket-arm isconcerned. This virtual paying out of the cable It permits the lowerextremity of the guide-beam 14:,and consequently the bucket 19, toincrease their dis tance from said shaft lO-in other words, permits thelowering of the bucket downward into the bank. The rotation of thesegment 11 aboui the shaft 10 causes the lowering of therear extremityof said segment, with the result that the bucket 19 is thrust downwardinto the bank, the force of said segment being transmitted to the beam14 by means of the shaft 13 and the force thus received by said beam 14being transmitted by the stop 29 thereon to the bucket-handle 20 andbucket 19. Tension in the cablej thus tends to force the bucket in aforward direction to take a cut and also in a direction at right anglesthereto to increase the thickness or depth of cut. To retract the bucketor raise it normally out of the bank, tension is exerted in the cable70, while the cable j is held fast. Such tension in the cable 7c has twoelfects upon the bucketarm, one elfect being to rotate the bucket-arm insuch a direction as to force the bucket in a forward direction and theother effect being to cause the lower extremity of the beam 14, andconsequently the bucket 19, to approach the sheave 18 upon said shaft10that is, to recededi rectlyoutof the bank. Said cables when a ct ingsimultaneously supplement each other in forcing the bucket in a forwarddir ction, and by suitably varying the relative amounts of tension insaid cables the thickness of cut may be regulated. By continuing thetension in one or both of the cables and k the bucket-arm may be rotateduntil the segment 11 or other part of said arm comes into contact withsome part of the crane, when the further motion of said arm is preventedandsaid cables become virtually attached to said crane. Either one ofsaid cables may alone maintain the bucket-arm in i his extreme position.(Shown in Fig. 1.) 1f now the cablejis free to run out from thesupporting structure a and the cable 70 continues to be under tensionalstrain, the result is that the parts of the turn table 9 lying to theright of the crane-pivot move toward the rear of the machine, andconsequently the forward extremity of the crane, together with the partsthereon, swings toward the right, looking in the direction of the arrow,Fig 8. Reversedly, if when the bucket-arm is in said extreme positionthe cable 71218 free to run out and the cablej continues to be drawn inupon the car a the crane and bucket-arm will be swung toward the left.In so far as the above-described control of the bucket-arm and theswinging of the crane are concerned my present machine is similar to themachine described by me inthe application above referred to, filed May7, 1900, Serial No. 15,705. The rotation of the crane at the time whenthe bucket is taking a cut is prevented by .the bank itself acting uponthe sides of the bucket, thereby preventing lateral motion of said craneand bucket even if one cable alone is in tension. When the bucket isfree from the bank, however, if one cable only is in tension the weightof the bucket-arm will induce a certain tendency to swing the crane,especiallyif the bucket is filled. This te'ndency for the bucket tocommence to swing immediately upon leavingthe bank is of great advantage, for time is thereby saved in swinging and said swinging motionof the crane and bucket-arm is imparted thereto gradually and withoutshock or jar. When the bucket has been hoisted and is to be extended fordischarging, the drums 49 and 51 are rotated by the engines 55 in such adirection that the cable 28 is wound in upon the drum 49 and the cable46 is allowed to run out from the drum 51. The resulting tension in thecable 28 causes the same to straighten and raise the pin 34 and latch 31in such a manner as to release the roller 24 from the hook 32 of saidlatch. The trolley 22 is thus released and free to travel upon theguide-beam 14, and the continued tension in said cable 28 causes saidtrolley to move along said beam toward the sheave 47, around which saidcable is trained. As the bucket-handle 20 is attached to said trolley,this motion of the trolley toward the lower or outer extremity of thebeam 14 causes a corresponding extension of said handle. The running out.of the cable 46 from the drum 51, permits the pin 41 at the apex of thefolding frame to move away from the sheave 56 upon the bridge 7, and asthe bucket-handle and bucket are positively forced in a direction awayfrom said sheave 56 the said shaft 41 is drawn in a forward direction bythe rods 42 42 and bail 44, said shaft 41 swinging about the shaft as acenter. The extension of the bucket-handle thus causes the unfolding ofthe bucket-supporting frame-that is, causes the rods 42 and post tospread apart. The positions of the'folding frame consequent upondifferent positions of the bucket-handle may be clearly seen byreferring consecutively to Figs. 1, 2, and 5 of the drawings. The weightof the parts is so distributed as to keep the cable 46 taut atpractically'all points Within the working limits of the bucket-arm, andthe folding frame therefore operating in conjunction with the cable 46forms the support for the bucket and adjacent portion of thebucket-handle in all positions thereof. Said cable and folding framevirtually constitute an adjustable truss, of which the post 40 forms thestrut or compression member and the rods 42 and cable 46 form the tiesor vtension members. When the bucket-arm is to be retracted, the enginesare run in such a direction that the cable 28 is unwound from the drum49 and the cable 46 is wound upon the drum 51. This pays out said cable28 and permits the trolley 22 to be moved toward the segment 11, whilethe cable 46 draws the shaft 41 toward the sheave 56, thereby causingthe folding or collapsing of the bucket-supporting frame, andconsequently a retraction of the bucket. By continuing the winding in ofthe cable 46 the bucket-handle 20 is brought to such a position that thetrolley 22 comes into contact with the stop 29 at the upper extremity ofthe guide-beam 14. Just before said trolley reaches this extremeposition the roller 24 on said trolley comes into contact with the underbeveled edge of the projection 33 of the latch 31, thereby raising saidlatch. When said roller has passed beyond the hook 32 of said latch, thecable 28 being slack, said hook drops over and engages said roller, andthereby automatically prevents the return of said trolley until saidlatch is again raised by the cable 28 in the manner hereinabovedescribed.

It is evident that the cables 28 and 46 are supplementary in theiraction and that the extension and retraction of the bucket and handlemay be controlled in a positive manner by the operator.

For convenience I have herein referred to the cablej as athrusting-cable, to the cable 7c as'a controlling-cable, and to thecables 28 and 46 as extending and retracting cables, respectively. Thecables j and 70, however, have important additional functions-n am ely,the rotation of the bucket-arm about the shafts a and the swinging ofthe crane.

It is obvious that while I have spoken of the beam 14 as a guide and thepart 20, sliding thereon, as a handle nevertheless said guide-beam andsliding part may be considered as together forming an extensiblebucket-handle.

Although I have minutely described the various parts of my machine, I donot confine myself to the details of construction herein set forth, forI am aware that various modifications will suggest themselves to thoseskilled in the art. For example, considerable changes may be made in lhecrane and manner of supporting the same and also in the manner ofguiding and operating the various cables, constructing the trolley, &c.,without. departing from my invention.

What I claim as new, and desire to secure by Letters Patent, is-

1. An excavator bucket-arm comprising a plurality of members, upon oneof which is supported a bucket, said bucket-supporting part beingmovable in the general direction of the length of said arm, andconnections between said bucket-supporting part and the other members ofsaid arm, one of said connections being a linked connection at thebucket extremity of said bucket-supporting part, and a second of saidconnections being a sliding connection at the upper extremity of saidbucket-supporting part.

2. In an excavator the combination of a crane, a linkwork pivoted tosaid crane, and a separate member carrying a bucket, said member beingextensibly and retraclably su pported upon said linkwork.

3. In an excavator bucket-arm, the combination of members forming, alinkwork, a bucket-supporting part movable in the direction of thelength of said linkwork, a linked connection between the bucket end ofsaid bucket-supporting part and said linkwork; and a sliding connectionbetween said linkwork and the extremity of said bucketsupporting partopposite to said bucket.

4. An excavator bucket-arm consisting of a plurality of members, one ofwhich is pivotally supported and forms the support for said arm; asecond member constitutinga compound bucket-handle; other members ofsaid arm connected to said pivoted arm-supporting member, saidbucket-handle being extensible and retractable upon itself; incombination with means for extending and retracting said bucket-handle.

5. In an excavator bucket-arm, the combination of a pivotally-supportedlinkwork, the members whereof are articulately connected in tandem, orvirtually end to end; a bucketsupport'ing part traveling longitudinallyon said linkwork; connections between said link work and saidbucket-supporting part whereby the latter is movable upon said linkwork;and cables for moving said bucket-supporting part upon said linkwork.

6. In an excavator,the combination of a pair of longitudinal members,one of which is pivotally supported, means at one extremity of saidmembers for articulately connecting the same, and a transversepower-receiving link connecting said members at the other extremitythereof; a power device connected to said transverse link and exertingits force in a line other than the line through the pivots of saidtransverse links; a bucket-supporting part; and means whereby saidbucket is extensibly and retractably supported upon said longitudinalmembers.

7. In an excavator, the combination of a pivotally-supported oscillatinglever,a thrustsegment pivotally supported upon said lever, other membershaving articulate connections to said lever and segment, one of saidother members forming a guide-beam; in combination with abucket-supportingpart which is extensible and retractable in thedirection of the length of said guide'beam, and a pair of cables forvarying the positions of the oscillating lever, thrust-segment andguide-beam relatively to each other.

8. In an excavator, the combination of a linkwork comprising a pluralityof parts one of which is a pivotally-supported lever, asecond of whichis a thrust-segment pivoted to said lever, and a third of which is aguide member pivoted to said segment; a bucketsupporting part; means formovably supporting one extremity of said bucket-supporting part on saidguide member; and a plurality of links whereby the other extremity ofsaid bucket-supporting part is supported on said pivoted lever.

9. In an excavator, the combination of a linkwork, constituting aportion of the bucket arm; a bucket-supportingpart; means Whereby thebucket extremity of said bucket-supporting part is movably supported onsaid link work, and a trolley whereby the other extremity of saidbucketsupporting part is slidingly supported on one of the members ofsaid linkwork.

10. In an excavator, a pivotally-supported bucket-arm comprising astructure composed of articulating links one of which constitutes asegment whereby the force of a'single power device is resolved into twocomponents operative upon a second member of said linked structure whichconstitutes aguide-beam, the periphery of said segment being the locusof the point of application of power to said arm, and said linkedstructure being provided with a joint between its point of support andpoint of power application; said bucket-arm also comprising abucket-supporting part movably supported upon said linked structure; incombination with means for fixing said bucketsupporting part relativelyto said guide-beam, said bucketsupporting part thereby receiving thesaid components of the force acting upon said segment.

11. In an excavator, a pivotally-supported bucket-arm comprising astructure composed of articulating links one of which constitutes asegment whereby the force of a single power device is resolved into twocomponents operative upon a second member of said linked structure whichconstitutes a guide-beam, the periphery of said segment being the locusof the point of application of power to said arm,

and said linked structure being provided with a joint between its pointof support and point of power application; said bucket-arm alsocomprisingabucket-supportingpartmovably supported upon said linkedstructure; in combination with a catch or latch on said guidebeam forengaging a part attached to said bucket-supporting part, therebyretaining the latter;

12. In an excavator, the combination of a linkwork constitutinga portionof the bucketarm; a separate bucket supporting part; means whereby oneextremity of said bucketsupporting part is movably connected to saidlinkwork; a second plurality of links whereby the other extremity ofsaid bncket-supporting part is supported by said linkwork; a powerdevice the force whereof is applied to said second plurality of linksfor moving the bucket-supporting part in one direction upon saidlinkwork; and a second power device the force whereof is applied to saidbucket-supporting part for moving the same in the opposite direction.

13. In an excavator bucket-arm, a revolubly-supported structure; aseparate bucketsupporting part, connections between one end of saidbucket-supporting part and said revolubly-supported structure, and afolding frame whereby the other end of said bucket supporting part iscarried by said revolublysupported structure; in combination with meansfor operating said frame.

1-1:. In an excavator, the combination of a linkwork constituting aportion of the bucketarm; a bucket-supporting part; means whereby theupper extremity of said supporting part is movably connected to saidlinkwork; a second plurality of links whereby the lower extremity ofsaid bucket-supporting part is supported by said linkwork, one of saidsecond plurality of links being a post pivotally supported upon saidfirst mentioned linkwork, and said second plurality of links alsocomprising connections between the upper or outer extremity of said postand the lower extremity of said bucket-supporting part.

15. In an excavator bucket-arm, a revolubly-supported structure, abucket-supporting part, connections between one end of saidbucket-supporting part and said revolublysupported structure, and afolding frame whereby the other end of said bucket-supporting part iscarried by said revolubly-sup ported structure; in combination with acatble, attached to said folding frame and making contact also with saidrevolubly-supported structure, thereby constituting in conjunction Withsaid folding frame, an adjust able truss.

IIO

16. In an excavator bucket-arm, a revolubly-supported structure, abucket-supporting part, sliding connections between one end of saidbucket-supporting part and said revolubly-supported structure, a foldingframe also connecting said bucket-supporting part with saidrevolubly-supported structure, and a guide-sheave mounted on saidrevolubly-supported structure; in combination with two power devices,one of which moves said bucket-supporti ng part, in one direction uponsaid revoluloly-supported structure, and the second of said powerdevices moves said bucket-supporting part in the opposite direction uponsaid revolubly-supported structure, said second power device comprisinga cable leading from said folding frame to said guide-sheave and thenceto suitable driving mechanism.

17. In an excavator bucket-arm, the combination of a pair oflongitudinal members one of which is revolubly supported, and the secondof which forms a guide beam or track; articulate connections between thelower extremities of said members; a transverse power-receiving linkconnecting the upper extremities of said longitudinal members; abucket-supporting part; and means for supporting said bucket-supportingpart on said longitudinal members, said means including a trolleyconnected to said bucket-supporting part and traveling upon said guidebeam or track.

18. In an excavator, the combination of a bucket, a pair of beamsattached to said bucket, a single beam forming a track or guide,'atrolley attached to said pair of beams for traveling upon said singlebeam, said single and double beams constituting a compoundbucket-handle; and means for supporting said beams.

19. In an excavator, the combination of a linkwork forming a portion ofa bucket-arm, a bucket-supporting part extensibly and retract'ablysupported on said linked structure, and a pair of cables havingconnections to opposite extremities of said bucket-supporting part forextending and retracting the same, a drum for operating said cables, andmeans for operating said drum.

20. In anexcavator bucket-arm, the combination of a pivotally-supportedoscillating lever, acompound bucket-handle the parts of which areextensible relatively to each other,

means for supporting said handle upon said .lever, and other means foradjusting said oscillating lever upon its pivotal support.

21. In an excavator, the combination of a crane,.a crane-support wherebysaid crane is revoluble about a vertical axis, a horizontal trackconcentric with the axis of the crane, an extension on said craneadapted to bear and travel upon said track, thereby forming an auxiliarysupport for said crane, and a hook attached to said crane and having anextension adapted to project beneath said track, and engage the samewhen the portion of the crane to which said hook is attached is raised.

22. In an excavator, the combination of a linked structure forming aportion of the bucket-arm, said linked structure comprising anoscillating lever, a thrust-segment pivoted to said lever, a guidemember pivoted to said segment, and other connections between said leverand guide member; a bucket-supporting part, carried by said linkedstructure and movable thereon in the direction of the length thereof;means for moving said bucket-supporting part on said linked structure,and cables for changing the configuration of said linked structure, oneof said cables being connected to said thrust-segment, and another ofsaid cables being con nected to one of the members of said linkedstructure, and also being deflected by another of the members of saidlinked structure.

23. In an excavator, the combination of a revoluble crane, a linkedstructure revolubly supported on said crane and forming a portion of thebucket-arm, a bucket-supporting part ext-ensiblyand retractablysupported on said linked structure, means for controllably extending andretracting said bucket-supporting part; a pair of cables connected tosaid linked structure for varying the configuration of the same androtating the same about its point of support; and guides for said cableslocated on the crane or its adjuncts whereby the force of said cables isoppositely directed to said crane with reference to the axis thereof,said cables thereby having a rotative effect upon said crane.

OLAF I-IE'ILES AETER.

Witnesses:

HOWARD M. Cox, ARTHUR M. Cox.

